3DHP Data Access

Source: vignettes/get_3dhp_data.Rmd

This vignette shows how to work with a new service based on data from the 3D Hydrography Program (3DHP) released in 2024. 3DHP data uses “mainstem” identifiers as the primary river ID. We’ll work with one for the Baraboo River in Wisconsin.

We can find one to start with at a url like:

https://reference.geoconnex.us/collections/mainstems/items?filter=name_at_outlet ILIKE '%Baraboo%'

This url searches the reference mainstem collection for rivers with names like “Baraboo”. Using that url query, we can find that the Baraboo mainstem ID is https://geoconnex.us/ref/mainstems/359842 and that it flows to the Wisconsin and Mississippi https://geoconnex.us/ref/mainstems/323742 and https://geoconnex.us/ref/mainstems/312091 respectively. At the reference mainstem page, we can also find that the outlet NHDPlusV2 COMID is https://geoconnex.us/nhdplusv2/comid/937070225.

The code block just below generates starting locations based on information derived from the reference mainstem for the Baraboo and a point location near the Baraboo’s outlet. It queries the 3DHP service for a flowline within a 10m buffer of the point specified just to get us started.


  comid <- "937070225"

  point <- c(-89.441, 43.487) |>
    sf::st_point() |>
    sf::st_sfc(crs = 4326) |> sf::st_sf()

  dm <- c('https://geoconnex.us/ref/mainstems/323742',
          'https://geoconnex.us/ref/mainstems/312091')

  flowline <- get_3dhp(point, type = "flowline", buffer = 10)

  mapview::mapview(list(point, flowline))

Now, we can use dataRetrieval to retrieve a basin upstream of this outlet location. We specify the NHDPlusV2 comid here since we know it, but could have used the point location just as well.

With the basin pulled from the findNLDI() function, we can pass it to get_3dhp() as a Area of Interest for flowlines, waterbodies, and hydrolocations. We can then use the mainstem ids of our two downstream mainstem rivers found above to get the downtream mainstem rivers.

  basin <- dataRetrieval::findNLDI(comid = comid, find = "basin")

  mapview::mapview(basin$basin)

  network <- get_3dhp(basin$basin, type = "flowline")
#> Getting features 0 to 2000 of 6842
#> Getting features 2000 to 4000 of 6842
#> Getting features 4000 to 6000 of 6842
#> Getting features 6000 to 6842 of 6842
  water <- get_3dhp(basin$basin, type = "waterbody")
#> Getting features 0 to 2000 of 3382
#> Getting features 2000 to 3382 of 3382
  hydrolocation <- get_3dhp(basin$basin, type = "hydrolocation")
#> Warning in (function (AOI = NULL, ids = NULL, type = NULL, where = NULL, :
#> sink, spring, waterbody outlet features found but were outside area of interest
#> polygon.
#> Warning: No sink, spring, waterbody outlet features found
#> Warning: No headwater, terminus, divergence, confluence, catchment outlet
#> features found in area of interest.
#> Getting features 0 to 2000 of 7006
#> Getting features 2000 to 4000 of 7006
#> Getting features 4000 to 6000 of 7006
#> Getting features 6000 to 7006 of 7006

  down_mains <- get_3dhp(ids = dm, type = "flowline")
#> Getting features 0 to 2000 of 3034
#> Getting features 2000 to 3034 of 3034

  map_data <- list(outlet = basin$origin,
                   basin = basin$basin,
                   flowline = network,
                   waterbody = water,
                   hydrolocation = hydrolocation,
                   down_mains = down_mains)

  mapview::mapview(map_data)